Study of the Suppressed Decays B^{\pm} \to[K^{\mp}π^{\pm}]_{D}K^{\pm} at Belle

Abstract

We report a study of the suppressed decay $B^{-}\to [K^{+}{\pi }^{-}{]}_D{K}^{-}$(and its charge-conjugate mode) at Belle, where $[K^{+}{\pi }^{-}{]}_D$ indicates that the $K^{+}{\pi }^{-}$ pair originates from a neutral $D$ meson. A data sample containing 274 million $B\bar{B}$ pairs recorded at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric $e^{+}{e}^{-}$ storage ring is used. This decay mode can be used to extract the CKM angle ${\varphi }_3$ using the so-called Atwood-Dunietz-Soni method. The signal for $B^{-}\to [K^{+}{\pi }^{-}{]}_D{K}^{-}$ has $2.7\sigma$ statistical significance, and we set a limit on the ratio of B decay amplitudes $r_B<0.28$ at the 90% confidence level. We observe a signal with $5.8\sigma$ statistical significance in the related mode, $B^{-}\to [K^{+}{\pi }^{-}{]}_D{\pi }^{-}$.

14 pages, 11 figures, submitted to ICHEP2004, Beijing, Chaina

Cited by in corpus (1)

• The 2004 UTfit Collaboration Report on the Status of the Unitarity Triangle in the Standard Model